Midsomer Murders is a British television detective drama that has aired on ITV since 1997. The show is based on the books by Caroline Graham, as originally adapted by Anthony Horowitz. The current lead character is DCI John Barnaby who works for Causton CID. Dudgeon's character is the younger cousin of former lead character DCI Tom Barnaby. Dudgeon joined the show in 2011 following Nettles's departure. The stories revolve around the Barnabys' efforts to solve the numerous murders that take place in the fictional English county of Midsomer. The Barnabys have had several sergeants throughout the run of the show: Sgt Gavin Troy, Sgt Dan Scott, Sgt Ben Jones and currently Sgt Charlie Nelson.